Hoisting derrick



A. W. SOUTHWICK.

HOISTING DERRICK. APFQLICATION HLED JULY 28,1921.

Patented Oct. 10, 1922.

A TTORNE Y Patented Oct. 10, 1922.

UNITED STATES ALFRED W. SOUTI-IWICK, OF NEW PORT, RHODE ISLAND.

I'IOISTING DERRICK.

Application filed July 28,

2' 0 all w hem it may concern:

Be it known that I, ALFRED W. SOUTH- wIoK, a citizen of the UnitedStates, residing in the city of Newport and State of 5 Rhode Island,have invented new and useful Improvements in Hoisting Derricks, of whichthe following is a specification, reference being had to theaccompanying drawings.

This invention is a hoisting derrick, and the object is to provide astrong and practicable elevating derrick for raising heavy loads such asstones, barrels of cement, or like burdens which would be difricult tohandle otherwise.

In the drawings:

Fig. 1 is a perspective view of the derrick partially elevated.

Fig. 2 is a top plan view.

Fig. 3 is a fragmentary detail of one set of posts and the attachedoperating crank and rack.

The invention includes a base ring 1 upon which are rigidly mountedthree equi-spaced tubular metal posts 2, same being inclined inwardlytoward a common central point. These posts 2 have elongated openings orwindows 3 cut away from their inner sides. lVithin the stationary posts2 are slidingly mounted three metal hoisting posts 4, with racks 5formed on their inner sides and facing the openings 3. Across theopenings 3 are journaled shafts 6 with pinions 7 thereon meshing withthe racks 5, the said shafts 35 having also cranks 8 with pawls 9 forlooking the posts 4 in elevated position. At the 1921.. Serial No.483,144.

upper ends of the hoisting posts are mounted iron rings 10 into whichare fastened chains 11 with hooks 12 at their ends. A circular frame 13depends from the hooks l2, and this frame has a pulley 14% dependingfrom its center with the operating cables 15. Steps 16 may be mounted onone of the posts 2 for the use of the operator. In use the derrick maybe first extended to the height desired, after which the loads areelevated in usual form by means of the pulley and cable.

While I have herein described a certain specific method of constructingand asse1n bling the elements of my invention, it is understood same maybe varied in minor de tails, not departing from the spirit of myinvention as defined in the appended claim.

I claim:

A hoisting derrick, comprising a base ring; outer, tubular, inwardlyinclined metal posts on the ring, said posts having elongated openingsthrough their inner faces; metal hoisting posts slidingly mounted withinthe outer posts; racks on the hoisting posts opposite the openings inthe outer posts; shafts journaled across said openings; pinions on theshafts meshing with the racks on the hoisting posts; handles on theshafts; lock pawls engaging the pinions; chains at the tops of thehoisting posts; a frame depending from said chains; and a pulley andcable at the center of the frame.

ALFRED W. SOUTHWICK. lVitnesses CORNELIUS C. MOORE, CHARLES H. SEEKELL.

